An addon file extension is related to the Zaplots CFS Console and used for its add-on files.
ADDON file extension - Zaplots CFS Console addon
What is addon file? How to open addon files?
File type specification:
The addon file extension is related to the CFS Console, a command line utility for Microsoft Windows that allows users to install apps developed by Zaplots.
The .addon file stores add-on for CFS Console that adds other features.
This addon file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.